InternetOpenURL读取图片出错

华亭真人 2009-06-12 10:21:04

异步读取，只能读一部分，更神奇的是，lpReadBuffer越小，读出来的越多。。。真不知道问题出在哪儿了
请高手来看下。。



/********************************************************************

	created:	2009/06/11

	created:	11:6:2009   19:31

	filename: 	inet2\main.cpp

	file path:	inet2

	file base:	main

	file ext:	cpp

	author:		FallingStar

	

	purpose:	MyInet

*********************************************************************/



#include<afx.h>



#include<wininet.h>

#include<process.h>

#include<iostream>

#include<fstream>

using namespace std;

#pragma  comment(lib,"wininet.lib")

#define _CRTDBG_MAP_ALLOC 

#include<stdlib.h> 

#define   UNICODE  

#define   _UNICODE 

#include<crtdbg.h>

#define		 TIMEOUT		3000



void __stdcall Callback(HINTERNET hInternet,

						DWORD dwContext,

						DWORD dwInternetStatus,

						LPVOID lpStatusInfo,

						DWORD dwStatusInfoLen);



CString ToString (DWORD i)

{

	CString str;

	str.Format("%d",i);

	return str;

	

}

HINTERNET hSession;

HINTERNET hFile;

HANDLE hComplete;

HANDLE CloseFile;



int i=250020;

void GetTitle()

{



}

void main()

{	



	hComplete=CreateEvent(NULL,FALSE,FALSE,NULL);

	

	CloseFile=CreateEvent(NULL,FALSE,FALSE,NULL);

	hSession = InternetOpen(NULL, 

		INTERNET_OPEN_TYPE_PRECONFIG,

		NULL,

		NULL,

        INTERNET_FLAG_ASYNC);

	

	if (InternetSetStatusCallback(hSession,

		(INTERNET_STATUS_CALLBACK)&Callback) == INTERNET_INVALID_STATUS_CALLBACK)

    {

		

		cout<<"回调函数注册失败"<<endl;

		return ;

    }

	for(UINT i=1;i<2;i++)

	{

		ResetEvent(CloseFile);

		ResetEvent(hComplete);



	CString url="http://vic.sina.com.cn/res/sh/beingmate/images/tt.jpg";

//		CString url="http://www.sina.com.cn";  这里换成新浪，400多K也能下完

		hFile =InternetOpenUrl(hSession,url,NULL,0,INTERNET_FLAG_NO_CACHE_WRITE|INTERNET_FLAG_PRAGMA_NOCACHE| INTERNET_FLAG_RELOAD,1);

		if(WaitForSingleObject(hComplete,3000)==WAIT_TIMEOUT)

		{

			fstream f;

			f.open("1.txt",ios::out|ios::app);

			cout<<"超时"<<endl;

			CString t;

			CTime time=CTime::GetCurrentTime();

			t=time.Format("%H:%M:%S");

			f<<(LPCSTR)t<<"   "<<i<<"  "<<"超时"<<endl;

			

		}

		else{

			

			bool bAllDone=false;

			fstream f;

			f.open(ToString(i)+".htm",ios::out|ios::app);

			do

			{

				

				char lpReadBuff[512];

				INTERNET_BUFFERS InetBuff;

				bool outed=false;

				ResetEvent(hComplete);

				memset(lpReadBuff,0,512);

				FillMemory(&InetBuff, sizeof(InetBuff), 0);

				InetBuff.dwStructSize = sizeof(InetBuff);

				InetBuff.lpvBuffer = lpReadBuff;

				InetBuff.dwBufferLength = sizeof(lpReadBuff) - 1;

				BOOL bOk=InternetReadFileEx(hFile,

					&InetBuff,

					IRF_ASYNC, 1);

				if(!bOk&&GetLastError()==ERROR_IO_PENDING)

				{

					

					WaitForSingleObject(hComplete,INFINITE);

					

				}

			

			

				f<<lpReadBuff;

				if (InetBuff.dwBufferLength == 0) 

				{

					bAllDone = TRUE;	 //这里判断应该没有问题的

				}

			}while(bAllDone==false);

			f.close();	

		}

		cout<<i<<endl;         

		InternetCloseHandle(hFile);

		hFile=NULL;

		WaitForSingleObject(CloseFile,INFINITE);

		

		

	}

	

	

	InternetSetStatusCallback(hSession,NULL);

	InternetCloseHandle(hSession);



	_CrtDumpMemoryLeaks();

	return ;

}







void __stdcall Callback(HINTERNET hInternet,

						DWORD dwContext,

						DWORD dwInternetStatus,

						LPVOID lpStatusInfo,

						DWORD dwStatusInfoLen)

{

	

	cout<<dwInternetStatus<<endl;

	

	switch(dwInternetStatus)

	{

	case INTERNET_STATUS_HANDLE_CREATED:

		{

			INTERNET_ASYNC_RESULT* res = (INTERNET_ASYNC_RESULT*)lpStatusInfo;

			hFile = (HINTERNET)(res->dwResult);

		}

		break;

	case INTERNET_STATUS_REQUEST_COMPLETE:

		{

		SetEvent(hComplete);

		}

		

		break;

	case INTERNET_STATUS_HANDLE_CLOSING:

		SetEvent(CloseFile);

		break;

	case INTERNET_STATUS_CONNECTION_CLOSED:

		break;

		

	}

	return;

	

	

	

}